one-to-many foreign key validation using onBindAndValidate

[busquelo]

Dear Springers,

Apologies for the noob question but I have been struggling with this for a day and searching the forums & lists with no luck.

Simple situation, you've seen it a million times.

one-many relationship between objectA and objectB, lets say Building and Apartment.

Apartment has a formController in which a list of Building populates a dropDown.

selecting a Building to which Apartment belongs sets a string value buildingID in the request.

The apartmentFormController (subclass of SimpleFormController) is trying to validate the data, and throws a bindException because String buildingID is not of type Building .

So I override onBindAndValidate to handle the binding of buildingID to Apartment.Building .

This works OK, but the BindException is still there, so my form never calls onSubmit and instead returns the page with the error message .

How do I get rid of the error so that I can process my form submission ?


OR ::: is there a better way to handle bindExceptions ? Do I need to write a custom validator for EVERY field that is a foreign key ?

many thanks for your considerations

busquelo

[busquelo]

maybe some code will help . am I doing something wrong here :

 protected void onBindAndValidate(HttpServletRequest request,
                      Object command, BindException errors)
               throws Exception {
        log.debug ("apartmentFormController::onbind, error count is: " + errors.getErrorCount());
        Apartment apt = (Apartment) command;
        String bldgId = request.getParameter("building");
        log.debug("bldgId is " + bldgId);
        apt.setBuilding(buildingManager.getBuilding(bldgId));
        log.debug ("set apt's building id, leaving method.");
            

    }

[delnoij]

Another approach that you might consider using is creating a custom PropertyEditor that will do the lookup for you. This is described in this thread:

http://forum.springframework.org/viewtopic.php?t=299

[busquelo]

Thanks, the custom PropertyEditor solved my issue !

Cheeeeeeers !